from selenium.webdriver.common.by import By
n = (By.ID, 'username')  # 账户
p = (By.ID, 'password')  # 密码
c = (By.ID, 'verify_code')  # 验证码
b = (By.NAME, 'sbtbutton')  # 提交
m = (By.LINK_TEXT, '安全退出')